Lifting-jack.



PATENTED JULY z8, 190s.

P. 1. JOYCE. LIIPIING JACK. APPLICATION FILED AUG.28, 1905.

z SHEETS-SHEET 1.

Q xbm 10.894,441.' I v PATBNTED'JULY', 1908.

RLJOYGE. I

yL IIVIING JACK. APPLIGATION FILED 5113.28, 1905.

2 SHBETs-SHEET 2.

Wb' Maase@ fllllfl "Il, I l. (111,.' .5o

For-actuating thew F6 'lftingpawl-llfwhwhii inner end o the lifting leverA 1 5', which lever FRANK-1 JoYcn, for Duron, 'onioi Ami?'.rr'li'ci; .'rilicfx-i To allwhom'fit may concern: Be itknown that l, FRAK JOYCE, a citi-y zeri of the United States, re's county of Montgomery, have-inventedv certainv new 'and useful Imovements in `Lifting-Jacks, of which the tion, reference' being had 'to the accompany* lng drawlngs, forming part oi'- speciication.`

.My invention relates to lifting'. j acks, incre,

particularly for `automobiles and the like, designed for somewhat lighter work thanthe"I f acks, but,`of course"7 adapted" work Within the capacity of heavy railway' for any class o the lack.

T e invention consistsv`- of that] certain novel construction and arrangement of parts? to be hereinafter particularly pointedV out and saine, taken on the lines 2'-'-2 of Fig.v 1. Fig. x -3 1s a horizontal section taken onthe lines 3 3 of Fig. 1'. Fi 4 isa frontelevationof theoperat-in Inec anisln the-springs arranged for owerin the'lifting bar step by step, and with the l tin pawl Ain ap'osltion .about to engage one of tv eteeth loi thegear wheel. Fig.- 5 isa similar view inthe second 5 with the liftingpawl-spring broken 'avifays4 Fi 7 is a sectional detailo loc ing the eccentric crank.

its uplper portion with 'a casing to in close the w eel 9, whichfis mountedonja shaft. 1 0.

journaled inthe casing, and whichwheelalso carries'the pinion 11 toen age theteeth 12 of-the rack vformedv on the'I ittin'g bar.1 3,yso thatby the rotation of theflwheel 9 thejlli-ting vbal? beliaisedorloweljedjf .i

I l 'Specic'ationoi Letters Patient. Arplieatioiiled'auguazs,1605. serum. arance.

sides of the casing.

iding `inDayton, lvided with lugs and/State of Ohio,

r '.rectionbeyolid its necessa ollowing isa full, clear, and exact descripclaimed, and especiallygconsists in the' `novel.construction and operationoi' apairof springs cooperating with the lifting andre-v theby adjust-f with r raisin y 4 position for, loweringu the lifting bar, with the'. retaining 'pawlreleased from 4the wh'eh' Fig. 6 'is a similar View to that{'shown in Flg.

the nieans'for 7 is the sanded-for the" jack, prvidd in Patented .my es, iaosfi is' pivoted on' the-pin 147'supported in thev The lifting leveris liinit the. inovernent'of the 4lever ingeitlie'r-.di

19 is the mamie? paw, weghtedzfat'its lower.` end to norma retaining vend of -the pawlv into y throw the upper enea ement 'whichpin 2 2 issecured t e hand crankZ.flfoiZ rotating the eccentric. The operat' j 'hanf 4 dle 45 otths` crank 23 is mountedlon t 'e 46, whichv carries a collar 47I seatedin there 'cess- '48 `in't'hefunder sid'eof the=crank' 23, while acoiledgspring 49 bears l etv\ reen-t his` collarv 47 andthe base 'of therecess 48 inthe crank, forcing thel inner'v end of the pin! 46 toward" the casing, and.. in the `two Working` pressinns2', 32 in t ecasing, so asto. lock the crank andthe eccentric in place. or?l positions seating the inthe 'sockets or deA- i dergto change the. position-of the eccentric," .i

the -o erator Ypulls tout 'the handle 45, which 24 is the liftingip'awlspring, the, upper endrv WS the.' Pin, 46 from .the rimessiI 32, gqf i "that thecrank can be turned 1.-,

ofwhich engagesinaslotted lug 25 oli-the" pawl', 'i the spring being coiled areund v.the

eccentric 21, 'and its A.lovifer end'bein" .held

between `the lugs' 26,-26 'on the casing.. This we spring `24 issoconstrcted-and coiled on the eccentric thatwhen theeccentrie is irifthe u spring willfbear upon lthe' lug 25, and keepr the pawl 14 pressed towards-the wheel,` the pawl, as thepawl is raised.` `Infy this osition position showninl 'lign` 1," the upper' end of the! 'spring itself sliding through the lug,y on the* of theecceritric towards the ywheeL-,t s e parts are `fal'ranged forraisingthe lifting bar, the `leverfl is raised and.lowered, the 4retaining p'aw1l 19ho1dingthe 'weight as 'the lever is .raised to permit the. pawl I4 to take into the next lower tooth, and as tlielver'is. lowered, the retaining. p'awl 1'9 is pushed' out of engage ment with vthe'-wl1eel and then-springs in toengage the Anent tooth yby its own; weight. 28 is another spring coiledon. the eccentnc 4with its lower 4end engaging` theslotted lng 29 011,th'6 heel 3 0 'of the retainrng-pawl. The upper end of-this vs ring "28' .extends up werds ong `the face oft e. inne-fiend of the lila-iisg out effect on the retaining pawl 19.

leaving sufficient spa-ee so that whe eccentric, around which the spring is coiled, is towards the wheel fi there is no tension on this spring, and it merely hangs loosely with- AYou', when it is desired to lower the lifting bai', the eceentricZ-l is rotated a half turn into the position shown in Figs. 4, 5, 'and G, and the effect of this rotation of the eccentric is to change the tension of both ofthe springsli and28 coiled thereon. ln this new position of the eccentric, the tension of the spring 24 is such as to tend t-o throw the lifting pawl 14 out of engagement with the wheel 9, so that 15 when the lift-ing lever 15 is raised, as shown in Fig. 4, the lifting pawl will become disengaged from the wheel while the retaining pawl will hold the Weight. As the lever 15 is then lowered, the pawl 14 will be raised until the pin 31 onv the lever 15 comes in conhigher tooth of the wheel.

tact with the spring 24, and the further lowering of the lifting lever will cause the pin 31 to push the spring towards the wheel, and thus carry the lifting pawl 14 into the next At. the same time that this movement takes place, the pin 31 willcontact with the upper end of the spring 28, which will exert a tension on the spring bearing with its lower end on the heel of the retaining pawl to throw the retaining pawl out of engagement with the wheel, and the load will then be carried by the lifting pawl, and by raising the lever 15, the Wheel 9 and the lifting bar 13 will be dropped e5 one tooth until the 31 is withdrawn from weight.

the end of the retaining pawl.v spring 28, when the retaining pawl by its counter Weight will be thrown into engagement with the next higher tooth, thus again taking the As soon as the retaining pawl takes the weight, the lifting pawl is thrown out of engagement with the wheel by the back tension of the spring 24, and the process is repeated until the lifting bar has been dropped stepby step as far as desired.

hile 1 have illustrated my improvements the lifting and retaining as applied to a construction of liftinfT jack in which a wheel and pinion are emp oyed to actuate the lifting bar, it will be evident that applied bars, and the lifting bar raised and lowered directly without the intervention of the wheel and pinion, and my invention, therefore, is equally applicable to the ordinaryT construction of strai ht bar jacks as well as to the geared jack which is illustrated in the d rawings.

Having thus described Imy invention,

what l claim as new, and desire to see-ure by Letters Patent, is:

1. ln a lift-ing jack, the combination' of a lifting' bar, a lever adapted to be operated to raise and lower said lifting bar, means inter- 5 mediate said lifting bar and lever for effectl i l i l pawls could be, directly on the rack of Athe lifting ii the ing the operation, a retaining device for said lifting bar, and a spring normally inoperative acting on said retaining device to reverse its operation when the lever is operated to lou er the lifting bar, and mechanism foi' throwing said spring into operation.

2. ln a lifting jack, the combination of a lifting bar, a lever, means intermediate the lifting bar and lever for raising said lifting bar, and a spiiiig to effect the operation when the lifting bar is raised, a movable mounting for said spring, with means for changing the relative position of said iiiovalile mounting, wherebyY the action of the intermediate means may be reversed for lowering the lifting bar.

3. In a lifting jack, the combination of a. lifting bar, a lever adapted to be operated to raise. and lower said lifting bar, m xans intermediate said lifting bai', and lever, for raising and lowering same, a retaining device for the lifting bar, and springs for enforcing the operation of said intermediate means, andietaiiiiiig device, said retaining device spring beingnormally inactive with mechanism for reversing the operation of the spring for said intermediate means and simultaneously throwing said retaining device spring into operation. l

4; ln a lifting jack, the combination of a lifting bar, a lever adapted to be operated to raise and lower said-lifting bar, a pawl piroted on the lever to effect said operation, a. spring to enforce the action of said pawl with a movable bearing point therefor, a re.- taining device for the lifting bar, and means for changing the bearing point of said spring, whereby the tension thereof may be reversed to reverse the action of the pawl when tho lifting bar is lowered.

5. ln a lifting jack, the combination of a j lifting bar, a lever adapted to be operated to raise and lower said lifting bar, a pawl pivoted on the lever to effect said operation, a spring to enforce the act-ion of said pawl, a retaining device for the lifting bar, and means for changing the position of said spring, and a pin on the lever to operate said spring to reverse the action of the pawl when the liftingbar is lowered.

6. ln a lifting jack, the combination of a lifting lia a lever to be operated to raise and lower said lifting bar, a retaining device for the lifting bar, and a spring normally inoperative, with means for changing the position of said spring, and mechanism for throwing said spring into operation to reverso the action of the retaining device when the lifting bar is lowered.

7. In a lifting jack, the combination of a lifting bar, a lever ada ted to be operated to raise and lower said lifting bar, a pawl pivoted on the lever to effect said operation, a spring to enforce the action of said pawl, a retaining device for the lifting bai, and .s spring normally inactive in contact with sait of engagement' retaining device, with means for changing the position of both'of said springs, 'and a pin on the lever to operate said springs t'oreverse the action of said pawLand ret lifting bar, a lever adapted to be operated to raise and lower said lifting bar, a pawl pivoted on the -lever t-o effect said operation, with a spring to'enforee'the .action of saidv pawl, a Weighted pawl to retaintlie lifting lo'ar, lwith a spring norniall')v -,inactive .in Contact with saidpawl, an eccentric pin, upon which said springs are mounted, and means for turning said eccentric to change the-position 'of said springs, with a pin on the lifting lever-to contact. xvitlisaid springs when changed.

9. In a lifting jac i, an actuating lever, a lifting pawl, a; holding pawl, a separate spring for each of said pavwls, and means' for putting said springs in action to foree'said pawls out during 'the lowering niovement, substantially as described.

10. ln la lifting jack, an' o ierating-lever, al lifting pawl actuated thereiiy, a spring for holding said lifting pawl in engagement dui'- ing the'lifting operation,l means for reversing the action of said spring'. during'tlie lowering operation, andpin on t ie Ao Jerating lever to Contact with said spring an force the liftin f` pawl into engagement at. predetermine times during the lowering operation, sub-- stantiallyf as described.

, aining device. y S. In a lifting jack, the combination of the` f g A i 11. In a lifting jack, an actuating lever, a lifting pawl, a holding awl, a separate spring for each of said paw s, and a movable device for putting said springs inaction to ore-e said pawls out of engagement during the lowering movement, substantially as described. y

12. ln an actuating lever, a lifting awl, a holding pawl, separa-te springs for eac i of said pawls, means for putt-ing said springs in action, to force said pawls out of engagement during the lowering movement and connection for each of said springs with the aetuating lever to overcome the action of .the lifting pawl spring and to release the tension of the holding pawlfspring, to perinit the pawls to come` into engagement, sub stantially asdescribed. Y v

13. In a'lifting jack, an actuating lever, a holding pa'wl pivoted to the frame of tlie jack, a spring arranged to force said p'awl ou'tv of operative position when -tlie load is being lowered, and means for releasing the tension of said spring lo` permit the holding p awl to take o erative position at predetermn'ied times uringsaid lowering operation, s'ubstantialluvas described.

FRANK I. JOYCE.

Witness's: i

DANIEL YV. ALLAMAN, Gao. W. LLEWELLYN.

a lifting ack 

